“Why is my page sprinkled with links to webresource.axd?”

JavaScript files – they contain the code implementing the client-side features of the controls

CSS files –they define the visual appearance of the controls

Images –various GIF, JPG or PNG files used by the CSS files

RadControls "Classic" embed all JavaScript files and the default skin (thoughtfully named "Default"). If you use any other skin or create your own it will be served from the location specified via the SkinsPath property ("~/RadControls/<ControlName>/Skins" by default).